Control device for internal combustion engine

Abstract

The present invention addresses a solution of improving precision with which requested torque at a time of a transient operation is realized in a control device for an internal combustion engine that controls torque that is generated by an internal combustion engine by control of an air amount by means of a throttle. To this end, the present control device calculates a target intake pipe pressure for realizing a target air amount, and calculates predicted pump loss from the target intake pipe pressure. By adding the predicted pump loss to requested torque to the internal combustion engine, 360° indicated requested torque that should be realized in a compression / expansion strokes is calculated. An air amount for realizing the 360° indicated requested torque is calculated as the target air amount, and an opening of the throttle is determined based on the target air amount.

Description

TECHNICAL FIELD [0001]The present invention relates to a control device for an internal combustion engine that controls torque that is generated by the internal combustion engine by control of an air amount by means of a throttle.BACKGROUND ART[0002]In the torque demand control of an internal combustion engine for an automobile, more particularly, a gasoline engine, which has been conventionally proposed, requested torque to the internal combustion engine is determined from the acceleration operation amount by a driver. Subsequently, the air amount for realizing the requested torque is determined as a target air amount, and the throttle opening is determined in accordance with the target air amount.[0003]Incidentally, the air amount that is controlled by a throttle affects the magnitude of the torque that is generated by fuel being combusted from a compression stroke to an expansion stroke. However, to be precise, the torque that is generated by an internal combustion engine is not ...

AI Technical Summary

Benefits of technology

The present control device uses predicted pump loss to calculate the target air amount, instead of actual pump loss, to achieve faster and more accurate air amount control. The control device calculates the predicted pump loss based on the target intake pipe pressure, so hunting does not occur in the throttle operation. By using actual pump loss in ignition timing control, the torque generated by the internal combustion engine becomes requested torque under the pump loss at the present point of time. The technical effect of this patent is to achieve more efficient and accurate air amount control and ignition timing control for optimal engine performance.

Problems solved by technology

However, the art disclosed in the above described literature has a problem.

Therefore, in the art disclosed in the above described literature, hunting occurs to the operation of the throttle at the time of a transient operation, and there arises the fear that control cannot be quickly performed to achieve the air amount that can realize the requested torque.

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